稳态机械阻抗法动测规律的应用研究

APPLICATION STUDY OF DYNAMIC PILE TESTING OF THE STABLE MECHANICAL IMPEDANCE METHOD

利用改进的复合平面应变轴对称的Ｂ－Ｎ法，计算得到了桩顶动力复刚度公式，并通过计算机分析得到完整桩、缩颈桩、断桩、离析桩、扩颈桩的速度导纳曲线规律及动刚度的变化规律，并结合实例对其应用作了说明．

In this Paper,a formulate to determine dynamic stiffness of pile base is derived by the imProved composite Plane strain axial symmetry B-N method. The theoretical Vo/Fo-f response curve and dynamic stiffness of integrity pile and defective pile such as change in crosssection,crack or segregation are obtained from computer analysis. Several cases are presented to confirm its reliability.